How does Stealthy Pursuer's triggered ability interact with the chain, and what happens if the friendly unit that triggered it is killed in response before the ability resolves?

Ruling: Stealthy Pursuer's ability is a triggered ability that uses the chain. If the friendly unit is killed in response to the trigger before Stealthy Pursuer's ability resolves, Stealthy Pursuer does not move because it cannot find "it" (the reference to the friendly unit).

Sequence:

• A friendly unit moves from Stealthy Pursuer's location
• Check for triggers; Stealthy Pursuer's ability triggers
• Window for responses to the trigger opens
• If the trigger resolves and the friendly unit still exists, you may choose to move Stealthy Pursuer
• If the initial move caused a showdown, it starts after any move triggers are resolved

Nuances:

• Movement itself never starts a chain, but triggered abilities do
• The ability implicitly references the unit's current location, which is no longer available if the unit is removed from the board
• The wording "moved with it" is considered unclear; "I may move to its location" would be clearer